Scaling Enthalpy

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Ryan Cerny 3I
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Scaling Enthalpy

Postby Ryan Cerny 3I » Fri Jan 20, 2017 9:35 am

For a reaction A + B -> C + 2D with all gases, and the dH of the reaction is, say, 100kj, would the following parameters be scaled with x amount of A?:
(1) the dH (would it be xdH for that amount reacted)?
(2) the dn (would the net change in moles of gas be scaled)?

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Re: Scaling Enthalpy

Postby Chem_Mod » Mon Jan 30, 2017 6:14 pm

Enthalpy written for a reaction A + B -> C + 2D is per 1 mole of A and 1 mole of B that react, and per 1 mole of C and 2 moles of D that form. So if ∆H = 100 kJ, then it is 100 kJ/mol A, but 50 kJ/mol D. Also, the change in moles of gas would be 1 mol gas/mol A, but 0.5 mol gas/mol D.

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